/*
   Android Session Activity

   Copyright 2013 Thincast Technologies GmbH, Author: Martin Fleisz

   This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. 
   If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

package com.freerdp.freerdpcore.presentation;

import android.app.AlertDialog;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.app.UiModeManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Point;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.inputmethodservice.Keyboard;
import android.inputmethodservice.KeyboardView;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.view.WindowManager;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import android.widget.Toast;
import android.widget.ZoomControls;

import com.freerdp.freerdpcore.R;
import com.freerdp.freerdpcore.application.GlobalApp;
import com.freerdp.freerdpcore.application.SessionState;
import com.freerdp.freerdpcore.domain.BookmarkBase;
import com.freerdp.freerdpcore.domain.ConnectionReference;
import com.freerdp.freerdpcore.domain.ManualBookmark;
import com.freerdp.freerdpcore.services.LibFreeRDP;
import com.freerdp.freerdpcore.utils.ClipboardManagerProxy;
import com.freerdp.freerdpcore.utils.KeyboardMapper;
import com.freerdp.freerdpcore.utils.Mouse;

import java.util.Collection;
import java.util.Iterator;
import java.util.List;

public class SessionActivity extends AppCompatActivity implements
        LibFreeRDP.UIEventListener, KeyboardView.OnKeyboardActionListener,
        ScrollView2D.ScrollView2DListener,
        KeyboardMapper.KeyProcessingListener, SessionView.SessionViewListener,
        TouchPointerView.TouchPointerListener,
        ClipboardManagerProxy.OnClipboardChangedListener {
    public static final String PARAM_CONNECTION_REFERENCE = "conRef";
    public static final String PARAM_INSTANCE = "instance";
    private static final float ZOOMING_STEP = 0.5f;
    private static final int ZOOMCONTROLS_AUTOHIDE_TIMEOUT = 4000;
    // timeout between subsequent scrolling requests when the touch-pointer is
    // at the edge of the session view
    private static final int SCROLLING_TIMEOUT = 50;
    private static final int SCROLLING_DISTANCE = 20;
    private static final String TAG = "FreeRDP.SessionActivity";
    // variables for delayed move event sending
    private static final int MAX_DISCARDED_MOVE_EVENTS = 3;
    private static final int SEND_MOVE_EVENT_TIMEOUT = 150;
    private Bitmap bitmap;
    private SessionState session;
    private SessionView sessionView;
    private TouchPointerView touchPointerView;
    private ProgressDialog progressDialog;
    private KeyboardView keyboardView;
    private KeyboardView modifiersKeyboardView;
    private ZoomControls zoomControls;
    private KeyboardMapper keyboardMapper;

    private Keyboard specialkeysKeyboard;
    private Keyboard numpadKeyboard;
    private Keyboard cursorKeyboard;
    private Keyboard modifiersKeyboard;

    private AlertDialog dlgVerifyCertificate;
    private AlertDialog dlgUserCredentials;
    private View userCredView;

    private UIHandler uiHandler;

    private int screen_width;
    private int screen_height;

    private boolean connectCancelledByUser = false;
    private boolean sessionRunning = false;
    private boolean toggleMouseButtons = false;

    private LibFreeRDPBroadcastReceiver libFreeRDPBroadcastReceiver;
    private ScrollView2D scrollView;
    // keyboard visibility flags
    private boolean sysKeyboardVisible = false;
    private boolean extKeyboardVisible = false;
    private int discardedMoveEvents = 0;
    private ClipboardManagerProxy mClipboardManager;
    private boolean callbackDialogResult;
    View mDecor;

    private void createDialogs() {
        // build verify certificate dialog
        dlgVerifyCertificate = new AlertDialog.Builder(this)
                .setTitle(R.string.dlg_title_verify_certificate)
                .setPositiveButton(android.R.string.yes,
                        new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog,
                                                int which) {
                                callbackDialogResult = true;
                                synchronized (dialog) {
                                    dialog.notify();
                                }
                            }
                        })
                .setNegativeButton(android.R.string.no,
                        new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog,
                                                int which) {
                                callbackDialogResult = false;
                                connectCancelledByUser = true;
                                synchronized (dialog) {
                                    dialog.notify();
                                }
                            }
                        }).setCancelable(false).create();

        // build the dialog
        userCredView = getLayoutInflater().inflate(R.layout.credentials, null,
                true);
        dlgUserCredentials = new AlertDialog.Builder(this)
                .setView(userCredView)
                .setTitle(R.string.dlg_title_credentials)
                .setPositiveButton(android.R.string.ok,
                        new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog,
                                                int which) {
                                callbackDialogResult = true;
                                synchronized (dialog) {
                                    dialog.notify();
                                }
                            }
                        })
                .setNegativeButton(android.R.string.cancel,
                        new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog,
                                                int which) {
                                callbackDialogResult = false;
                                connectCancelledByUser = true;
                                synchronized (dialog) {
                                    dialog.notify();
                                }
                            }
                        }).setCancelable(false).create();
    }

    private boolean hasHardwareMenuButton() {
        if (Build.VERSION.SDK_INT <= 10)
            return true;

        if (Build.VERSION.SDK_INT >= 14) {
            boolean rc = false;
            final ViewConfiguration cfg = ViewConfiguration.get(this);

            return cfg.hasPermanentMenuKey();
        }

        return false;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // show status bar or make fullscreen?
        if (ApplicationSettingsActivity.getHideStatusBar(this)) {
            getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                    WindowManager.LayoutParams.FLAG_FULLSCREEN);
        }

        this.setContentView(R.layout.session);
        if (hasHardwareMenuButton() || ApplicationSettingsActivity.getHideActionBar(this)) {
            this.getSupportActionBar().hide();
        } else
            this.getSupportActionBar().show();

        Log.v(TAG, "Session.onCreate");

        // ATTENTION: We use the onGlobalLayout notification to start our
        // session.
        // This is because only then we can know the exact size of our session
        // when using fit screen
        // accounting for any status bars etc. that Android might throws on us.
        // A bit weird looking
        // but this is the only way ...
        final View activityRootView = findViewById(R.id.session_root_view);
        activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(
                new OnGlobalLayoutListener() {
                    @Override
                    public void onGlobalLayout() {
                        screen_width = activityRootView.getWidth();
                        screen_height = activityRootView.getHeight();

                        // start session
                        if (!sessionRunning && getIntent() != null) {
                            processIntent(getIntent());
                            sessionRunning = true;
                        }
                    }
                });

        sessionView = (SessionView) findViewById(R.id.sessionView);
        sessionView.setScaleGestureDetector(new ScaleGestureDetector(this,
                new PinchZoomListener()));
        sessionView.setSessionViewListener(this);
        sessionView.requestFocus();

        touchPointerView = (TouchPointerView) findViewById(R.id.touchPointerView);
        touchPointerView.setTouchPointerListener(this);

        keyboardMapper = new KeyboardMapper();
        keyboardMapper.init(this);
        keyboardMapper.reset(this);

        modifiersKeyboard = new Keyboard(getApplicationContext(),
                R.xml.modifiers_keyboard);
        specialkeysKeyboard = new Keyboard(getApplicationContext(),
                R.xml.specialkeys_keyboard);
        numpadKeyboard = new Keyboard(getApplicationContext(),
                R.xml.numpad_keyboard);
        cursorKeyboard = new Keyboard(getApplicationContext(),
                R.xml.cursor_keyboard);

        // hide keyboard below the sessionView
        keyboardView = (KeyboardView) findViewById(R.id.extended_keyboard);
        keyboardView.setKeyboard(specialkeysKeyboard);
        keyboardView.setOnKeyboardActionListener(this);

        modifiersKeyboardView = (KeyboardView) findViewById(R.id.extended_keyboard_header);
        modifiersKeyboardView.setKeyboard(modifiersKeyboard);
        modifiersKeyboardView.setOnKeyboardActionListener(this);

        scrollView = (ScrollView2D) findViewById(R.id.sessionScrollView);
        scrollView.setScrollViewListener(this);
        uiHandler = new UIHandler();
        libFreeRDPBroadcastReceiver = new LibFreeRDPBroadcastReceiver();

        zoomControls = (ZoomControls) findViewById(R.id.zoomControls);
        zoomControls.hide();
        zoomControls.setOnZoomInClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                resetZoomControlsAutoHideTimeout();
                zoomControls.setIsZoomInEnabled(sessionView
                        .zoomIn(ZOOMING_STEP));
                zoomControls.setIsZoomOutEnabled(true);
            }
        });
        zoomControls.setOnZoomOutClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                resetZoomControlsAutoHideTimeout();
                zoomControls.setIsZoomOutEnabled(sessionView
                        .zoomOut(ZOOMING_STEP));
                zoomControls.setIsZoomInEnabled(true);
            }
        });

        toggleMouseButtons = false;

        createDialogs();

        // register freerdp events broadcast receiver
        IntentFilter filter = new IntentFilter();
        filter.addAction(GlobalApp.ACTION_EVENT_FREERDP);
        registerReceiver(libFreeRDPBroadcastReceiver, filter);

        mClipboardManager = ClipboardManagerProxy.getClipboardManager(this);
        mClipboardManager.addClipboardChangedListener(this);

        mDecor = getWindow().getDecorView();
        mDecor.setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
    }

    @Override
    protected void onStart() {
        super.onStart();
        Log.v(TAG, "Session.onStart");
    }

    @Override
    protected void onRestart() {
        super.onRestart();
        Log.v(TAG, "Session.onRestart");
    }

    @Override
    protected void onResume() {
        super.onResume();
        Log.v(TAG, "Session.onResume");
    }

    @Override
    protected void onPause() {
        super.onPause();
        Log.v(TAG, "Session.onPause");

        // hide any visible keyboards
        showKeyboard(false, false);
    }

    @Override
    protected void onStop() {
        super.onStop();
        Log.v(TAG, "Session.onStop");
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.v(TAG, "Session.onDestroy");

        // Cancel running disconnect timers.
        GlobalApp.cancelDisconnectTimer();

        // Disconnect all remaining sessions.
        Collection<SessionState> sessions = GlobalApp.getSessions();
        for (SessionState session : sessions)
            LibFreeRDP.disconnect(session.getInstance());

        // unregister freerdp events broadcast receiver
        unregisterReceiver(libFreeRDPBroadcastReceiver);

        // remove clipboard listener
        mClipboardManager.removeClipboardboardChangedListener(this);

        // free session
        GlobalApp.freeSession(session.getInstance());

        session = null;
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);

        // reload keyboard resources (changed from landscape)
        modifiersKeyboard = new Keyboard(getApplicationContext(),
                R.xml.modifiers_keyboard);
        specialkeysKeyboard = new Keyboard(getApplicationContext(),
                R.xml.specialkeys_keyboard);
        numpadKeyboard = new Keyboard(getApplicationContext(),
                R.xml.numpad_keyboard);
        cursorKeyboard = new Keyboard(getApplicationContext(),
                R.xml.cursor_keyboard);

        // apply loaded keyboards
        keyboardView.setKeyboard(specialkeysKeyboard);
        modifiersKeyboardView.setKeyboard(modifiersKeyboard);

        mDecor.setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
    }

    private void processIntent(Intent intent) {
        // get either session instance or create one from a bookmark/uri
        Bundle bundle = intent.getExtras();
        Uri openUri = intent.getData();
        if (openUri != null) {
            // Launched from URI, e.g:
            // freerdp://user@ip:port/connect?sound=&rfx=&p=password&clipboard=%2b&themes=-
            connect(openUri);
        } else if (bundle.containsKey(PARAM_INSTANCE)) {
            int inst = bundle.getInt(PARAM_INSTANCE);
            session = GlobalApp.getSession(inst);
            bitmap = session.getSurface().getBitmap();
            bindSession();
        } else if (bundle.containsKey(PARAM_CONNECTION_REFERENCE)) {
            BookmarkBase bookmark = null;
            String refStr = bundle.getString(PARAM_CONNECTION_REFERENCE);
            if (ConnectionReference.isHostnameReference(refStr)) {
                bookmark = new ManualBookmark();
                bookmark.<ManualBookmark>get().setHostname(
                        ConnectionReference.getHostname(refStr));
            } else if (ConnectionReference.isBookmarkReference(refStr)) {
                if (ConnectionReference.isManualBookmarkReference(refStr))
                    bookmark = GlobalApp.getManualBookmarkGateway().findById(
                            ConnectionReference.getManualBookmarkId(refStr));
                else
                    assert false;
            }

            if (bookmark != null)
                connect(bookmark);
            else
                closeSessionActivity(RESULT_CANCELED);
        } else {
            // no session found - exit
            closeSessionActivity(RESULT_CANCELED);
        }
    }

    private void connect(BookmarkBase bookmark) {
        session = GlobalApp.createSession(bookmark, getApplicationContext());

        BookmarkBase.ScreenSettings screenSettings = session.getBookmark()
                .getActiveScreenSettings();
        Log.v(TAG, "Screen Resolution: " + screenSettings.getResolutionString());
        if (screenSettings.isAutomatic()) {
            if ((getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) >= Configuration.SCREENLAYOUT_SIZE_LARGE) {
                // large screen device i.e. tablet: simply use screen info
                screenSettings.setHeight(screen_height);
                screenSettings.setWidth(screen_width);
            } else {
                // small screen device i.e. phone:
                // Automatic uses the largest side length of the screen and
                // makes a 16:10 resolution setting out of it
                int screenMax = (screen_width > screen_height) ? screen_width
                        : screen_height;
                screenSettings.setHeight(screenMax);
                screenSettings.setWidth((int) ((float) screenMax * 1.6f));
            }
        }
        if (screenSettings.isFitScreen()) {
            screenSettings.setHeight(screen_height);
            screenSettings.setWidth(screen_width);
        }

        connectWithTitle(bookmark.getLabel());
    }

    private void connect(Uri openUri) {
        session = GlobalApp.createSession(openUri, getApplicationContext());

        connectWithTitle(openUri.getAuthority());
    }

    private void connectWithTitle(String title) {
        session.setUIEventListener(this);

        progressDialog = new ProgressDialog(this);
        progressDialog.setTitle(title);
        progressDialog.setMessage(getResources().getText(
                R.string.dlg_msg_connecting));
        progressDialog.setButton(ProgressDialog.BUTTON_NEGATIVE, "Cancel",
                new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        connectCancelledByUser = true;
                        LibFreeRDP.cancelConnection(session.getInstance());
                    }
                });
        progressDialog.setCancelable(false);
        progressDialog.show();

        Thread thread = new Thread(new Runnable() {
            public void run() {
                session.connect(getApplicationContext());
            }
        });
        thread.start();
    }

    // binds the current session to the activity by wiring it up with the
    // sessionView and updating all internal objects accordingly
    private void bindSession() {
        Log.v(TAG, "bindSession called");
        session.setUIEventListener(this);
        sessionView.onSurfaceChange(session);
        scrollView.requestLayout();
        keyboardMapper.reset(this);
        mDecor.setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);

    }

    private void hideSoftInput() {
        InputMethodManager mgr = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);

        if (mgr.isActive()) {
            mgr.toggleSoftInput(InputMethodManager.HIDE_NOT_ALWAYS, 0);
        } else {
            mgr.toggleSoftInput(0, InputMethodManager.HIDE_NOT_ALWAYS);
        }
    }

    // displays either the system or the extended keyboard or non of them
    private void showKeyboard(final boolean showSystemKeyboard,
                              final boolean showExtendedKeyboard) {
        // no matter what we are doing ... hide the zoom controls
        // TODO: this is not working correctly as hiding the keyboard issues a
        // onScrollChange notification showing the control again ...
        uiHandler.removeMessages(UIHandler.HIDE_ZOOMCONTROLS);
        if (zoomControls.getVisibility() == View.VISIBLE)
            zoomControls.hide();

        InputMethodManager mgr = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);

        if (showSystemKeyboard) {
            // hide extended keyboard
            keyboardView.setVisibility(View.GONE);
            // show system keyboard
            mgr.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0);

            // show modifiers keyboard
            modifiersKeyboardView.setVisibility(View.VISIBLE);
        } else if (showExtendedKeyboard) {
            // hide system keyboard
            hideSoftInput();

            // show extended keyboard
            keyboardView.setKeyboard(specialkeysKeyboard);
            keyboardView.setVisibility(View.VISIBLE);
            modifiersKeyboardView.setVisibility(View.VISIBLE);
        } else {
            // hide both
            hideSoftInput();
            keyboardView.setVisibility(View.GONE);
            modifiersKeyboardView.setVisibility(View.GONE);

            // clear any active key modifiers)
            keyboardMapper.clearlAllModifiers();
        }

        sysKeyboardVisible = showSystemKeyboard;
        extKeyboardVisible = showExtendedKeyboard;
    }

    private void closeSessionActivity(int resultCode) {
        // Go back to home activity (and send intent data back to home)
        setResult(resultCode, getIntent());
        finish();
    }

    // update the state of our modifier keys
    private void updateModifierKeyStates() {
        // check if any key is in the keycodes list

        List<Keyboard.Key> keys = modifiersKeyboard.getKeys();
        for (Iterator<Keyboard.Key> it = keys.iterator(); it.hasNext(); ) {
            // if the key is a sticky key - just set it to off
            Keyboard.Key curKey = it.next();
            if (curKey.sticky) {
                switch (keyboardMapper.getModifierState(curKey.codes[0])) {
                    case KeyboardMapper.KEYSTATE_ON:
                        curKey.on = true;
                        curKey.pressed = false;
                        break;

                    case KeyboardMapper.KEYSTATE_OFF:
                        curKey.on = false;
                        curKey.pressed = false;
                        break;

                    case KeyboardMapper.KEYSTATE_LOCKED:
                        curKey.on = true;
                        curKey.pressed = true;
                        break;
                }
            }
        }

        // refresh image
        modifiersKeyboardView.invalidateAllKeys();
    }

    private void sendDelayedMoveEvent(int x, int y) {
        if (uiHandler.hasMessages(UIHandler.SEND_MOVE_EVENT)) {
            uiHandler.removeMessages(UIHandler.SEND_MOVE_EVENT);
            discardedMoveEvents++;
        } else
            discardedMoveEvents = 0;

        if (discardedMoveEvents > MAX_DISCARDED_MOVE_EVENTS)
            LibFreeRDP.sendCursorEvent(session.getInstance(), x, y,
                    Mouse.getMoveEvent());
        else
            uiHandler.sendMessageDelayed(
                    Message.obtain(null, UIHandler.SEND_MOVE_EVENT, x, y),
                    SEND_MOVE_EVENT_TIMEOUT);
    }

    private void cancelDelayedMoveEvent() {
        uiHandler.removeMessages(UIHandler.SEND_MOVE_EVENT);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.session_menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // refer to http://tools.android.com/tips/non-constant-fields why we
        // can't use switch/case here ..
        int itemId = item.getItemId();

        if (itemId == R.id.session_touch_pointer) {
            // toggle touch pointer
            if (touchPointerView.getVisibility() == View.VISIBLE) {
                touchPointerView.setVisibility(View.INVISIBLE);
                sessionView.setTouchPointerPadding(0, 0);
            } else {
                touchPointerView.setVisibility(View.VISIBLE);
                sessionView.setTouchPointerPadding(
                        touchPointerView.getPointerWidth(),
                        touchPointerView.getPointerHeight());
            }
        } else if (itemId == R.id.session_sys_keyboard) {
            showKeyboard(!sysKeyboardVisible, false);
        } else if (itemId == R.id.session_ext_keyboard) {
            showKeyboard(false, !extKeyboardVisible);
        } else if (itemId == R.id.session_disconnect) {
            showKeyboard(false, false);
            LibFreeRDP.disconnect(session.getInstance());
        }

        return true;
    }

    @Override
    public void onBackPressed() {
        // hide keyboards (if any visible) or send alt+f4 to the session
        if (sysKeyboardVisible || extKeyboardVisible)
            showKeyboard(false, false);
        else
            keyboardMapper.sendAltF4();
    }

    @Override
    public boolean onKeyLongPress(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            LibFreeRDP.disconnect(session.getInstance());
            return true;
        }
        return super.onKeyLongPress(keyCode, event);
    }

    // android keyboard input handling
    // We always use the unicode value to process input from the android
    // keyboard except if key modifiers
    // (like Win, Alt, Ctrl) are activated. In this case we will send the
    // virtual key code to allow key
    // combinations (like Win + E to open the explorer).
    @Override
    public boolean onKeyDown(int keycode, KeyEvent event) {
        return keyboardMapper.processAndroidKeyEvent(event);
    }

    @Override
    public boolean onKeyUp(int keycode, KeyEvent event) {
        return keyboardMapper.processAndroidKeyEvent(event);
    }

    // onKeyMultiple is called for input of some special characters like umlauts
    // and some symbol characters
    @Override
    public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) {
        return keyboardMapper.processAndroidKeyEvent(event);
    }

    // ****************************************************************************
    // KeyboardView.KeyboardActionEventListener
    @Override
    public void onKey(int primaryCode, int[] keyCodes) {
        keyboardMapper.processCustomKeyEvent(primaryCode);
    }

    @Override
    public void onText(CharSequence text) {
    }

    @Override
    public void swipeRight() {
    }

    @Override
    public void swipeLeft() {
    }

    @Override
    public void swipeDown() {
    }

    @Override
    public void swipeUp() {
    }

    @Override
    public void onPress(int primaryCode) {
    }

    @Override
    public void onRelease(int primaryCode) {
    }

    // ****************************************************************************
    // KeyboardMapper.KeyProcessingListener implementation
    @Override
    public void processVirtualKey(int virtualKeyCode, boolean down) {
        LibFreeRDP.sendKeyEvent(session.getInstance(), virtualKeyCode, down);
    }

    @Override
    public void processUnicodeKey(int unicodeKey) {
        LibFreeRDP.sendUnicodeKeyEvent(session.getInstance(), unicodeKey, true);
        LibFreeRDP.sendUnicodeKeyEvent(session.getInstance(), unicodeKey, false);
    }

    @Override
    public void switchKeyboard(int keyboardType) {
        switch (keyboardType) {
            case KeyboardMapper.KEYBOARD_TYPE_FUNCTIONKEYS:
                keyboardView.setKeyboard(specialkeysKeyboard);
                break;

            case KeyboardMapper.KEYBOARD_TYPE_NUMPAD:
                keyboardView.setKeyboard(numpadKeyboard);
                break;

            case KeyboardMapper.KEYBOARD_TYPE_CURSOR:
                keyboardView.setKeyboard(cursorKeyboard);
                break;

            default:
                break;
        }
    }

    @Override
    public void modifiersChanged() {
        updateModifierKeyStates();
    }

    // ****************************************************************************
    // LibFreeRDP UI event listener implementation
    @Override
    public void OnSettingsChanged(int width, int height, int bpp) {

        if (bpp > 16)
            bitmap = Bitmap.createBitmap(width, height, Config.ARGB_8888);
        else
            bitmap = Bitmap.createBitmap(width, height, Config.RGB_565);

        session.setSurface(new BitmapDrawable(bitmap));

        if (session.getBookmark() == null) {
            // Return immediately if we launch from URI
            return;
        }

        // check this settings and initial settings - if they are not equal the
        // server doesn't support our settings
        // FIXME: the additional check (settings.getWidth() != width + 1) is for
        // the RDVH bug fix to avoid accidental notifications
        // (refer to android_freerdp.c for more info on this problem)
        BookmarkBase.ScreenSettings settings = session.getBookmark()
                .getActiveScreenSettings();
        if ((settings.getWidth() != width && settings.getWidth() != width + 1)
                || settings.getHeight() != height
                || settings.getColors() != bpp)
            uiHandler
                    .sendMessage(Message.obtain(
                            null,
                            UIHandler.DISPLAY_TOAST,
                            getResources().getText(
                                    R.string.info_capabilities_changed)));
    }

    @Override
    public void OnGraphicsUpdate(int x, int y, int width, int height) {
        LibFreeRDP.updateGraphics(session.getInstance(), bitmap, x, y, width,
                height);

        sessionView.addInvalidRegion(new Rect(x, y, x + width, y + height));

		/*
         * since sessionView can only be modified from the UI thread any
		 * modifications to it need to be scheduled
		 */

        uiHandler.sendEmptyMessage(UIHandler.REFRESH_SESSIONVIEW);
    }

    @Override
    public void OnGraphicsResize(int width, int height, int bpp) {
        // replace bitmap
        if (bpp > 16)
            bitmap = Bitmap.createBitmap(width, height, Config.ARGB_8888);
        else
            bitmap = Bitmap.createBitmap(width, height, Config.RGB_565);
        session.setSurface(new BitmapDrawable(bitmap));

		/*
         * since sessionView can only be modified from the UI thread any
		 * modifications to it need to be scheduled
		 */
        uiHandler.sendEmptyMessage(UIHandler.GRAPHICS_CHANGED);
    }

    @Override
    public boolean OnAuthenticate(StringBuilder username, StringBuilder domain,
                                  StringBuilder password) {
        // this is where the return code of our dialog will be stored
        callbackDialogResult = false;

        // set text fields
        ((EditText) userCredView.findViewById(R.id.editTextUsername))
                .setText(username);
        ((EditText) userCredView.findViewById(R.id.editTextDomain))
                .setText(domain);
        ((EditText) userCredView.findViewById(R.id.editTextPassword))
                .setText(password);

        // start dialog in UI thread
        uiHandler.sendMessage(Message.obtain(null, UIHandler.SHOW_DIALOG,
                dlgUserCredentials));

        // wait for result
        try {
            synchronized (dlgUserCredentials) {
                dlgUserCredentials.wait();
            }
        } catch (InterruptedException e) {
        }

        // clear buffers
        username.setLength(0);
        domain.setLength(0);
        password.setLength(0);

        // read back user credentials
        username.append(((EditText) userCredView
                .findViewById(R.id.editTextUsername)).getText().toString());
        domain.append(((EditText) userCredView
                .findViewById(R.id.editTextDomain)).getText().toString());
        password.append(((EditText) userCredView
                .findViewById(R.id.editTextPassword)).getText().toString());

        return callbackDialogResult;
    }

    @Override
    public boolean OnGatewayAuthenticate(StringBuilder username, StringBuilder domain, StringBuilder password) {
        // this is where the return code of our dialog will be stored
        callbackDialogResult = false;

        // set text fields
        ((EditText) userCredView.findViewById(R.id.editTextUsername))
                .setText(username);
        ((EditText) userCredView.findViewById(R.id.editTextDomain))
                .setText(domain);
        ((EditText) userCredView.findViewById(R.id.editTextPassword))
                .setText(password);

        // start dialog in UI thread
        uiHandler.sendMessage(Message.obtain(null, UIHandler.SHOW_DIALOG,
                dlgUserCredentials));

        // wait for result
        try {
            synchronized (dlgUserCredentials) {
                dlgUserCredentials.wait();
            }
        } catch (InterruptedException e) {
        }

        // clear buffers
        username.setLength(0);
        domain.setLength(0);
        password.setLength(0);

        // read back user credentials
        username.append(((EditText) userCredView
                .findViewById(R.id.editTextUsername)).getText().toString());
        domain.append(((EditText) userCredView
                .findViewById(R.id.editTextDomain)).getText().toString());
        password.append(((EditText) userCredView
                .findViewById(R.id.editTextPassword)).getText().toString());

        return callbackDialogResult;
    }

    @Override
    public int OnVerifiyCertificate(String commonName, String subject, String issuer, String fingerprint, boolean mismatch) {
        // see if global settings says accept all
        if (ApplicationSettingsActivity.getAcceptAllCertificates(this))
            return 0;

        // this is where the return code of our dialog will be stored
        callbackDialogResult = false;

        // set message
        String msg = getResources().getString(
                R.string.dlg_msg_verify_certificate);
        msg = msg + "\n\nSubject: " + subject + "\nIssuer: " + issuer
                + "\nFingerprint: " + fingerprint;
        dlgVerifyCertificate.setMessage(msg);

        // start dialog in UI thread
        uiHandler.sendMessage(Message.obtain(null, UIHandler.SHOW_DIALOG,
                dlgVerifyCertificate));

        // wait for result
        try {
            synchronized (dlgVerifyCertificate) {
                dlgVerifyCertificate.wait();
            }
        } catch (InterruptedException e) {
        }

        return callbackDialogResult ? 1 : 0;
    }

    @Override
    public int OnVerifyChangedCertificate(String commonName, String subject, String issuer, String fingerprint, String oldSubject, String oldIssuer, String oldFingerprint) {
        // see if global settings says accept all
        if (ApplicationSettingsActivity.getAcceptAllCertificates(this))
            return 0;

        // this is where the return code of our dialog will be stored
        callbackDialogResult = false;

        // set message
        String msg = getResources().getString(
                R.string.dlg_msg_verify_certificate);
        msg = msg + "\n\nSubject: " + subject + "\nIssuer: " + issuer
                + "\nFingerprint: " + fingerprint;
        dlgVerifyCertificate.setMessage(msg);

        // start dialog in UI thread
        uiHandler.sendMessage(Message.obtain(null, UIHandler.SHOW_DIALOG,
                dlgVerifyCertificate));

        // wait for result
        try {
            synchronized (dlgVerifyCertificate) {
                dlgVerifyCertificate.wait();
            }
        } catch (InterruptedException e) {
        }

        return callbackDialogResult ? 1 : 0;
    }

    @Override
    public void OnRemoteClipboardChanged(String data) {
        Log.v(TAG, "OnRemoteClipboardChanged: " + data);
        mClipboardManager.setClipboardData(data);
    }

    // ****************************************************************************
    // ScrollView2DListener implementation
    private void resetZoomControlsAutoHideTimeout() {
        uiHandler.removeMessages(UIHandler.HIDE_ZOOMCONTROLS);
        uiHandler.sendEmptyMessageDelayed(UIHandler.HIDE_ZOOMCONTROLS,
                ZOOMCONTROLS_AUTOHIDE_TIMEOUT);
    }

    @Override
    public void onScrollChanged(ScrollView2D scrollView, int x, int y,
                                int oldx, int oldy) {
        zoomControls.setIsZoomInEnabled(!sessionView.isAtMaxZoom());
        zoomControls.setIsZoomOutEnabled(!sessionView.isAtMinZoom());
        if (!ApplicationSettingsActivity.getHideZoomControls(this)
                && zoomControls.getVisibility() != View.VISIBLE)
            zoomControls.show();
        resetZoomControlsAutoHideTimeout();
    }

    // ****************************************************************************
    // SessionView.SessionViewListener
    @Override
    public void onSessionViewBeginTouch() {
        scrollView.setScrollEnabled(false);
    }

    @Override
    public void onSessionViewEndTouch() {
        scrollView.setScrollEnabled(true);
    }

    @Override
    public void onSessionViewLeftTouch(int x, int y, boolean down) {
        if (!down)
            cancelDelayedMoveEvent();

        LibFreeRDP.sendCursorEvent(
                session.getInstance(),
                x,
                y,
                toggleMouseButtons ? Mouse.getRightButtonEvent(this, down) : Mouse
                        .getLeftButtonEvent(this, down));

        if (!down)
            toggleMouseButtons = false;
    }

    public void onSessionViewRightTouch(int x, int y, boolean down) {
        if (!down)
            toggleMouseButtons = !toggleMouseButtons;
    }

    @Override
    public void onSessionViewMove(int x, int y) {
        sendDelayedMoveEvent(x, y);
    }

    @Override
    public void onSessionViewScroll(boolean down) {
        LibFreeRDP.sendCursorEvent(session.getInstance(), 0, 0,
                Mouse.getScrollEvent(this, down));
    }

    // ****************************************************************************
    // TouchPointerView.TouchPointerListener
    @Override
    public void onTouchPointerClose() {
        touchPointerView.setVisibility(View.INVISIBLE);
        sessionView.setTouchPointerPadding(0, 0);
    }

    private Point mapScreenCoordToSessionCoord(int x, int y) {
        int mappedX = (int) ((float) (x + scrollView.getScrollX()) / sessionView
                .getZoom());
        int mappedY = (int) ((float) (y + scrollView.getScrollY()) / sessionView
                .getZoom());
        if (mappedX > bitmap.getWidth())
            mappedX = bitmap.getWidth();
        if (mappedY > bitmap.getHeight())
            mappedY = bitmap.getHeight();
        return new Point(mappedX, mappedY);
    }

    @Override
    public void onTouchPointerLeftClick(int x, int y, boolean down) {
        Point p = mapScreenCoordToSessionCoord(x, y);
        LibFreeRDP.sendCursorEvent(session.getInstance(), p.x, p.y,
                Mouse.getLeftButtonEvent(this, down));
    }

    @Override
    public void onTouchPointerRightClick(int x, int y, boolean down) {
        Point p = mapScreenCoordToSessionCoord(x, y);
        LibFreeRDP.sendCursorEvent(session.getInstance(), p.x, p.y,
                Mouse.getRightButtonEvent(this, down));
    }

    @Override
    public void onTouchPointerMove(int x, int y) {
        Point p = mapScreenCoordToSessionCoord(x, y);
        LibFreeRDP.sendCursorEvent(session.getInstance(), p.x, p.y,
                Mouse.getMoveEvent());

        if (ApplicationSettingsActivity.getAutoScrollTouchPointer(this)
                && !uiHandler.hasMessages(UIHandler.SCROLLING_REQUESTED)) {
            Log.v(TAG, "Starting auto-scroll");
            uiHandler.sendEmptyMessageDelayed(UIHandler.SCROLLING_REQUESTED,
                    SCROLLING_TIMEOUT);
        }
    }

    @Override
    public void onTouchPointerScroll(boolean down) {
        LibFreeRDP.sendCursorEvent(session.getInstance(), 0, 0,
                Mouse.getScrollEvent(this, down));
    }

    @Override
    public void onTouchPointerToggleKeyboard() {
        showKeyboard(!sysKeyboardVisible, false);
    }

    @Override
    public void onTouchPointerToggleExtKeyboard() {
        showKeyboard(false, !extKeyboardVisible);
    }

    @Override
    public void onTouchPointerResetScrollZoom() {
        sessionView.setZoom(1.0f);
        scrollView.scrollTo(0, 0);
    }

    @Override
    public boolean onGenericMotionEvent(MotionEvent e) {
        super.onGenericMotionEvent(e);
        switch (e.getAction()) {
            case MotionEvent.ACTION_SCROLL:
                final float vScroll = e.getAxisValue(MotionEvent.AXIS_VSCROLL);
                if (vScroll < 0) {
                    LibFreeRDP.sendCursorEvent(session.getInstance(), 0, 0, Mouse.getScrollEvent(this, false));
                }
                if (vScroll > 0) {
                    LibFreeRDP.sendCursorEvent(session.getInstance(), 0, 0, Mouse.getScrollEvent(this, true));
                }
                break;
        }
        return true;
    }

    // ****************************************************************************
    // ClipboardManagerProxy.OnClipboardChangedListener
    @Override
    public void onClipboardChanged(String data) {
        Log.v(TAG, "onClipboardChanged: " + data);
        LibFreeRDP.sendClipboardData(session.getInstance(), data);
    }

    private class UIHandler extends Handler {

        public static final int REFRESH_SESSIONVIEW = 1;
        public static final int DISPLAY_TOAST = 2;
        public static final int HIDE_ZOOMCONTROLS = 3;
        public static final int SEND_MOVE_EVENT = 4;
        public static final int SHOW_DIALOG = 5;
        public static final int GRAPHICS_CHANGED = 6;
        public static final int SCROLLING_REQUESTED = 7;

        UIHandler() {
            super();
        }

        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case GRAPHICS_CHANGED: {
                    sessionView.onSurfaceChange(session);
                    scrollView.requestLayout();
                    break;
                }
                case REFRESH_SESSIONVIEW: {
                    sessionView.invalidateRegion();
                    break;
                }
                case DISPLAY_TOAST: {
                    Toast errorToast = Toast.makeText(getApplicationContext(),
                            msg.obj.toString(), Toast.LENGTH_LONG);
                    errorToast.show();
                    break;
                }
                case HIDE_ZOOMCONTROLS: {
                    zoomControls.hide();
                    break;
                }
                case SEND_MOVE_EVENT: {
                    LibFreeRDP.sendCursorEvent(session.getInstance(), msg.arg1,
                            msg.arg2, Mouse.getMoveEvent());
                    break;
                }
                case SHOW_DIALOG: {
                    // create and show the dialog
                    ((Dialog) msg.obj).show();
                    break;
                }
                case SCROLLING_REQUESTED: {
                    int scrollX = 0;
                    int scrollY = 0;
                    float[] pointerPos = touchPointerView.getPointerPosition();

                    if (pointerPos[0] > (screen_width - touchPointerView
                            .getPointerWidth()))
                        scrollX = SCROLLING_DISTANCE;
                    else if (pointerPos[0] < 0)
                        scrollX = -SCROLLING_DISTANCE;

                    if (pointerPos[1] > (screen_height - touchPointerView
                            .getPointerHeight()))
                        scrollY = SCROLLING_DISTANCE;
                    else if (pointerPos[1] < 0)
                        scrollY = -SCROLLING_DISTANCE;

                    scrollView.scrollBy(scrollX, scrollY);

                    // see if we reached the min/max scroll positions
                    if (scrollView.getScrollX() == 0
                            || scrollView.getScrollX() == (sessionView.getWidth() - scrollView
                            .getWidth()))
                        scrollX = 0;
                    if (scrollView.getScrollY() == 0
                            || scrollView.getScrollY() == (sessionView.getHeight() - scrollView
                            .getHeight()))
                        scrollY = 0;

                    if (scrollX != 0 || scrollY != 0)
                        uiHandler.sendEmptyMessageDelayed(SCROLLING_REQUESTED,
                                SCROLLING_TIMEOUT);
                    else
                        Log.v(TAG, "Stopping auto-scroll");
                    break;
                }
            }
        }
    }

    private class PinchZoomListener extends
            ScaleGestureDetector.SimpleOnScaleGestureListener {
        private float scaleFactor = 1.0f;

        @Override
        public boolean onScaleBegin(ScaleGestureDetector detector) {
            scrollView.setScrollEnabled(false);
            return true;
        }

        @Override
        public boolean onScale(ScaleGestureDetector detector) {

            // calc scale factor
            scaleFactor *= detector.getScaleFactor();
            scaleFactor = Math.max(SessionView.MIN_SCALE_FACTOR,
                    Math.min(scaleFactor, SessionView.MAX_SCALE_FACTOR));
            sessionView.setZoom(scaleFactor);

            if (!sessionView.isAtMinZoom() && !sessionView.isAtMaxZoom()) {
                // transform scroll origin to the new zoom space
                float transOriginX = scrollView.getScrollX()
                        * detector.getScaleFactor();
                float transOriginY = scrollView.getScrollY()
                        * detector.getScaleFactor();

                // transform center point to the zoomed space
                float transCenterX = (scrollView.getScrollX() + detector
                        .getFocusX()) * detector.getScaleFactor();
                float transCenterY = (scrollView.getScrollY() + detector
                        .getFocusY()) * detector.getScaleFactor();

                // scroll by the difference between the distance of the
                // transformed center/origin point and their old distance
                // (focusX/Y)
                scrollView.scrollBy(
                        (int) ((transCenterX - transOriginX) - detector
                                .getFocusX()),
                        (int) ((transCenterY - transOriginY) - detector
                                .getFocusY()));
            }

            return true;
        }

        @Override
        public void onScaleEnd(ScaleGestureDetector de) {
            scrollView.setScrollEnabled(true);
        }
    }

    private class LibFreeRDPBroadcastReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            // still got a valid session?
            if (session == null)
                return;

            // is this event for the current session?
            if (session.getInstance() != intent.getExtras().getLong(
                    GlobalApp.EVENT_PARAM, -1))
                return;

            switch (intent.getExtras().getInt(GlobalApp.EVENT_TYPE, -1)) {
                case GlobalApp.FREERDP_EVENT_CONNECTION_SUCCESS:
                    OnConnectionSuccess(context);
                    break;

                case GlobalApp.FREERDP_EVENT_CONNECTION_FAILURE:
                    OnConnectionFailure(context);
                    break;
                case GlobalApp.FREERDP_EVENT_DISCONNECTED:
                    OnDisconnected(context);
                    break;
            }
        }

        private void OnConnectionSuccess(Context context) {
            Log.v(TAG, "OnConnectionSuccess");

            // bind session
            bindSession();

            if (progressDialog != null) {
                progressDialog.dismiss();
                progressDialog = null;
            }

            if (session.getBookmark() == null) {
                // Return immediately if we launch from URI
                return;
            }

            // add hostname to history if quick connect was used
            Bundle bundle = getIntent().getExtras();
            if (bundle != null
                    && bundle.containsKey(PARAM_CONNECTION_REFERENCE)) {
                if (ConnectionReference.isHostnameReference(bundle
                        .getString(PARAM_CONNECTION_REFERENCE))) {
                    assert session.getBookmark().getType() == BookmarkBase.TYPE_MANUAL;
                    String item = session.getBookmark().<ManualBookmark>get()
                            .getHostname();
                    if (!GlobalApp.getQuickConnectHistoryGateway()
                            .historyItemExists(item))
                        GlobalApp.getQuickConnectHistoryGateway()
                                .addHistoryItem(item);
                }
            }
        }

        private void OnConnectionFailure(Context context) {
            Log.v(TAG, "OnConnectionFailure");

            // remove pending move events
            uiHandler.removeMessages(UIHandler.SEND_MOVE_EVENT);

            if (progressDialog != null) {
                progressDialog.dismiss();
                progressDialog = null;
            }

            // post error message on UI thread
            if (!connectCancelledByUser)
                uiHandler.sendMessage(Message.obtain(
                        null,
                        UIHandler.DISPLAY_TOAST,
                        getResources().getText(
                                R.string.error_connection_failure)));

            closeSessionActivity(RESULT_CANCELED);
        }

        private void OnDisconnected(Context context) {
            Log.v(TAG, "OnDisconnected");

            // remove pending move events
            uiHandler.removeMessages(UIHandler.SEND_MOVE_EVENT);

            if (progressDialog != null) {
                progressDialog.dismiss();
                progressDialog = null;
            }

            session.setUIEventListener(null);
            closeSessionActivity(RESULT_OK);
        }
    }

}
